Once you get the bracket off, hopefully there will be enough of the screw protruding above the frame to grab with a small pair of vise grips. If so, use plenty of penetrating oil, and gently work the stub back and forth- - - -don't try to muscle it out.

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Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!